Enhance Turbo Performance with Boost Monkey Turbo Oil Drain Outlet Flange Adapter -AN10 Fitting Review

Good drain valve. I wish it could be ported to a rectangular turbo outlet ---> A round drain. I had to do it myself with a dremel.

Fits my Holset He341cw perfectly, just drill 1/2 in the center to improve drainage. When you receive them they are about 10mm inside diameter and I drilled them to 12.5mm with a 1/2" drill bit, every diameter counts.

The flange arrived very rough, there were tons of metal burrs on the machined part, the bolt holes were too small and needed to be drilled, and the AN's center oil feed hole was also over .100". small. Spend your money elsewhere and buy an excellent product from a known good supplier.

Just a note for those planning to use it on Garrett, Precision or Borg units. The exit diameter is only .4280" (55/128) instead of the .625" (5/8) these companies require. I had to grind the outlet to the right size. Bolt 8x1.25x20mm. In addition, the surfaces are well processed and have a good finish.

. He is very small. Most of them are 1/2 size or larger. I drilled that one half inch and it should work fine, can't remember what size it was before. But it was way smaller than any of my other 10 inch items. The quality seems ok, just needs to be opened slightly.

Came like the picture and what others have described, you could probably open the opening/hole a bit. It should also be noted that it indicates the turbo brands for which this is best suited. I have a Precision Turbo that requires a square hole drain. I've seen people use round drain fittings with no problem, but I wouldn't risk it, so I'm keeping this part as a backup. as I found a square drain hole which is a 4" rigid pipe pointing straight down to avoid it going into the exhaust housing.